mezzio-swoole Applications Using Diactoros Vulnerable to HTTP Host Header Attack

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

not scored

EPSS

No dated EPSS signal available.

As published by the source; long descriptions are shortened.

Impact mezzio-swoole applications using Diactoros for their PSR-7 implementation, and which are either not behind a proxy, or can be accessed via untrusted proxies, can potentially have the host, protocol, and/or port of a Laminas\Diactoros\Uri instance associated with the incoming server request modified to reflect values from X-Forwarded- headers. Such changes can potentially lead to XSS attacks (if a fully-qualified URL is used in links) and/or URL poisoning. Patches 3.7.0, and 4.3.0 and later. The patches present in these versions update the SwooleServerRequestFactory to filter out X-Forwarded- headers when creating the initial request. They then by default pass that instance through a Laminas\Diactoros\ServerRequestFilter\FilterUsingXForwardedHeaders instance created from the trustReservedSubnet() constructor, ensuring that the request only honors the X-Forwarded- headers for private reserved subnets. Users can define the…

Published by the source

29 Jul 2022, 22:26 UTC

Last modified by the source

12 Jan 2023, 05:03 UTC

Source last checked

26 Oct 2026, 13:56 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-c8rp-cgf4-937w

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# Patch Next advisory brief: GHSA-c8rp-cgf4-937w

Advisory: mezzio-swoole Applications Using Diactoros Vulnerable to HTTP Host Header Attack
IDs: GHSA-c8rp-cgf4-937w
Record: https://patchnext.com/advisories/ghsa-c8rp-cgf4-937w (revision 1, source checked 26 Oct 2026, 13:56 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Unrated
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: mezzio/mezzio-swoole 4.3.0, 3.7.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist mezzio/mezzio-swoole: affected < 3.7.0; >= 4.0.0, < 4.3.0; fixed in 4.3.0, 3.7.0

## Suggested inspection (read-only)
- Packagist mezzio/mezzio-swoole: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on mezzio/mezzio-swoole.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-c8rp-cgf4-937w (GitHub-reviewed advisory GHSA-c8rp-cgf4-937w lists affected ranges: Packagist mezzio/mezzio-swoole >=0 =4.0.0 <4.3.0)

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